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Ultrastructural variations of plastids in a leaf blade of rice are examined by electron microscopy. Plastids are identified by their starch-accumulating activity in detached leaves illuminated for 48 h. Plastids are observed in all the tissues that contain cytoplasm. The structure of plastids varies among different tissues but is rather uniform within a tissue. Among various types of plastids other than chloroplasts in chloren-chyma, plastids of guard cells, sieve elements, and companion cells are characteristic of the respective tissues. Ultrastructural features of vascular bundles and stomata of the leaf blade of rice are also described.
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Miyake et al. (1976) studied this question.
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